Introduction to conic sections | Conic sections | Algebra II | Khan Academy
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- เผยแพร่เมื่อ 14 มิ.ย. 2009
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What are conic sections and why are they called "conic sections"?
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KHANic sections.
XD, you beat me to it.
Areeb Shahjahan beat both of you by two years!
You stole my joke
I just come here with the sole intention of making that joke
Great to hear that. Maybe I can do a series of videos on why bones break and how they heal (dedicated to you of course!). Actually, that's a pretty good idea. Need to do the basic bio first to do the healing part.
omgggg justin biebeeeeeeeeer
@@alibabaintelligence8281 what
Still trying to work out how to arrange the plane and the cone to get that.
Thank you Sal. I work in an orthopaedic office and everyday I send all the kids that come in, to your website. The moms and dads come back to thank me for the info. When I talk to the kids I ask them how their math is in school and they look at me and say, "well I passed!" and then there's a chuckle. I've become a hit for them because they leave with more than a cast.
If only I had learnt from you Sir. I would have feared maths less and be fascinated by its beauty more. I now understand why some people's eyes have a glint when they talk about maths. Thank you for your contribution.
you're an amazing teacher! thank you for your time, sounds like you truly have a passion for teaching :D
Your comparison of the two dimensional plain representing a single cross section of a three dimensional object completely just changed my picture of geometry, thank you.
this video is older than me and i still learned loads thanks man
Dude you are amazing. If everyone learned math like this, we would have a world of geniuses. Thank :)
It's one part talent and one part that he cares.
A rare combination. Far too rare.
Wow just realized this video is over 12 years old.... and thanks to this over-a-decade old video I for the first time finally understand those conic figures at the end. They always looked so complicated but I finally understand it now!
most excellent! good explanation.
Thanks for the relations between them. I'm looking forward for the different equations for the ellipse.... parameter.... polar.... etc. and how they relate to each other. You have the gift.
ATTACK OF THE COLORED LINES!!
Thank you so much.
You can not understand how greatly thankful I am to for you, you're what we need in front of our classrooms and at our dining tables teaching kids things.
Just, thank you.
really great introduction :)
wonderful explanation, I am programmer, and maths always attracts me, and i was rusty and checking what i studied 21 yrs ago, and wallah this explanation is clear, and i re-learned the things today.
Thank you for such wonderful lesson.
Everytime i open one of your videos, i learn something new... that is the joy of watching your videoz, Thank you Sal
That video was amazing! Great job Sal
At 2:30 you have a smiley face lol
+aaron flores It is a tilted parabola. You are funny
Spanish Beard awww
hahahahaha this made me laugh
Why does noone reply to any of the comments below?
Thank you Sir! I graduated high school with your help!! Thankyouu
thanks for doing what you do; mathematics is fascinating
My favourite of all your videos so far. very well explained indeed
Awesome video, very clear understanding at the end of it's ten minutes. Audio quality was superb.
I would never pass without you Sal, thank you very much!!!!!!!!
I wish I had you as a teacher, your brilliant
Sal you really are amazing... I mean I'm sure there are some guys out there who do reasearch into things and work out complicated stuff but I'm not sure they understand things like you do.... and definately do not present or explain things as well...
Yes, there really ought to be a cool 3D software that shows all this more clearly.
Thanks for the idea!
I actually fell asleep your voice is so soothing.
Oh you're too kind. It would be a neat idea and I'm quite certain some first year ortho resident would find it most appreciative to see this on You Tube as well as the kids who go on your website to learn how bones heal as well as break. I think you explained Wolf's Law in one of your physics videos.
Thanks keep up the good work sir
thx huge help for my class
Great introduction
Thank you for this. I'm trying to learn the topics I missed in High School to prepare for college this fall. Is this in a playlist yet? Which playlist would it be? Conics or precalc?
That's beautiful! It's sad that most math teachers in high school are too exhausted and the students themselves are too lazy to emphasize the beauty of mathematical concepts. I wish I knew this before so that i could have truely understood conics and be able to pass the tests. Instead, my math teacher was nice enough in 11th grade to drop this test and signed me up for AP calculus AB for the next year. Well, now that I'm a freshman in college calculus 2 leveled,Iwishiknewthisearlier
4:20
smiley face :)
your drawings are amazing
Still helpful for an old video and this is better than all the math videos from 2006 and 2007.
Thank you!!!!! Now that I have watched your videos I understand all of it!!!! I use your website too. :D
My teachers motto this semester:
Learn it yourself I am being fired for DUI!
Joy.
Thanks to you I learned conics and logarithms
Very cool, orbits are great.
well you learn something new everyday :)
The funnest thing is i'm in pre-algebra and now i know and can look into the future :]
"you don't do this in your algebra 2 class"
I am actually using this video for a project in my algebra 2 class where we are doing exactly what you said we shouldn't XD
thank u sir for excellent lecture
Im currently learning this through BYU. this is much better
pioneering e learning!
Dude this video is still useful even after 10 years of when it was published
11
12
YES!!!!!!!
The canadian education system skipped THE ENTIRE CONIC SECTION on PURPOSE!!! and the SAT math II REQUIRES CONICS!!!!!!!!!!!!
THANKS!!!!!!!!!!!!!!!!!!!!!!!!!!
I guess you never heard of Khan Academy,just search for khanacademy on google and visit their website and browse through the entire collection of video lectures.
Sir I like your video the way u do explain and make us understand, as a student I want to give you an suggestion please don't take it other way sir I thik your videos could be more clearly understandable if you add animations to it to explain concepts like conic sections and it would be ease for u too also to explain.😊
You are amazing.🤓
Thank you khan academy
subtitled in 21 different languges. wow good job 👍
Now I'm less likely to fail my test. I literally made a 0 on a quiz to to a lack of understanding
Dude the best channel !!! 1000×better than byjus
Awsm teaching
I like your humor khan academy :))
i learn more from this channel than i do from my school teacher
thank you
@weurRTG Thanks, I'm 17, in Quebec we learn this in the equivalent of I don't know how it works, somewhere in high school maybe, and it think it's really hard.
Haha, 4:17 there's a smily face :)
12 years ago but I need this experience now
lol
I learned alot
thnx good explanation
Thats so true, but i still understand it all... once the jargon is outta the way..
Thank you :)
Write down an outline for your video, will help with guessing what to explain next.
yeah, correct! us too.
Reviewing conics for central force :3
Thank you for this video. I am taking precalculus in college. It really helps. Thanks again, Sal Khan, Khan Academy
Thankyou
Exercise in 3-d drawing!! :D XD
Smiley face!
Yelling facial expressions is not how facial expressions work
What if you put the plane completely vertical and in the centre of the cone? Is the result of that an absolute value graph...or am I just confusing myself now?
Nice video btw! :)
I love you sir.
jajajj you drew a smiley face
2:14 happy face
Check this out! This video has a Download button in the description !!!
Thanks thanks thanks
Everyone from Teague and Anderson, this is pretty good stuff! Better hope we don't end up chasing this down with 8 sections of notes though. XD Have a great day everyone!
#p.4 teauge? nah #'s too lame
Baylife
Wow, this was before khan academy was even a thing, this was the beginnings when sal was alone, ig that's why the software and video quality is low
define focus?
Can u link previous videos please also using all maths on khan webpage how long is that going to take as takeb 5 days and only learnt 20 skills
The parabola should've been drawn as a line in the planar view, not a curve, since the plan you're cutting with is perpendicular to the plan view.
@SOLOVEFUCKINGmuz Algebra II is usually taught at age 15, or 10th grade. However, I've seen 11th grade students take the course, and I've even seen 8th graders take the course.
I took it as a 9th grade student.
The line and point are both conic sections as well, yes?
Prrrrraabola!!
when he started the 3D drawing I kept moving my head right and left without even noticing lol XD
@Lady Oscar lol GOD BLESS ❤️✨😂🙏🏽
i am watching it in 2017
2:21 looks like a smiley..
studying for my upcoming midterm and then my final...i hope i do well! :/
bluerose83092 well...did you do well?
PARABOLA ANR CIRCLES
Hey the formulas for parabola are not y = x^2 and x = y^2.....But they are x^2 = 4ay and y^2 = 4ax.....
+tuhin Dey Well, if I had to comment, yeah it looks right
10:52 ... wow
is an ebola a conic section? hee hee
ah thanks for this video. good old algebra two :)
Oh my god.. seriously!!!?
Hello ! 10 years ago
Ebola joke 10 years ago...
Is Corona a conic section?
So is a point a conics section... if your plane is horizontal right in the point that the two tips of the cones meet?
❤❤
Sir I have a question: wasn't that parabola one intersecting the above cone (the one which was parallel ) so won't it will actually become a hyperbola?
+Netra raman You're just viewing it wrong. If it's parallel, it will never cross.